Orthotics and Prosthetics

3. A PVA bag is placed over the cast and the
anterior section.
4. When patient weighs less than 175 lb, four
layers of Perlon stockinette are applied to cast.
For heavier patients, two layers of fiberglass are
used.
5. One piece of fiberglass mat about 2 in.
wide is placed under the medial flare of the tibia
running distally along the medial side under the
sole of the foot, going proximal along the lateral
side of foot and ending under head of the fibula.
6. A T-shaped fiberglass mat is placed under
the sole of the foot cupping the heel and going
proximally halfway up the medial and lateral
sides.
7. Two layers of fiberglass stockinette are
applied.
8. Four additional layers of Perlon stockinette
are applied.
9. The second PVA bag is applied.
10. Lamination is then accomplished with
700g of resin - 80% Laminar Harz - 20% Degaplast
than 175 lb., an additional fiberglass mat is placed
under the medial flare and under the sole of the
foot to neck of the fibula.
11. Lamination is carried out under a vacuum
of 20 kg/sq cm.
12. Lamination is removed by cutting through
the anterior part of the shank section, taking care
not to cut through the first section.
13. The trimlines of the shank section are then
drawn (Fig. 30).
Fig. 28. The hindfoot section of the cast has been built
up with hard SACH-foot rubber to allow relief of the
hindfoot during weight-bearing.
Fig. 29. The second lamination process is begun following
the addition of layers of Perlon, fiberglass stockinette,
fiberglass matting, and a PVA foil.